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It ensures that the ETL process functions well with other upstream and downstream processes. A Data warehouse implementation is a collection of many components, and hence integration testing is a must. Typically, system testing only includes testing within the ETL application.

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Big data application testing

This will depend on a number of factors, including: time/budget, data quality policy of your organization, data quality of the source dataset, complexity of each layer, etc. A general guideline is, …
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